1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176

use std::fmt;
use std::cmp;
use std::hash;

#[cfg(feature = "nightly")]
use std::alloc::{ alloc, dealloc, Layout, };

// 
// Feature: alloc_layout_extra
// 

// 8 Bytes ( 64 Bits )
/// ECMAScript String
#[cfg(feature = "nightly")]
#[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Clone)]
pub struct String {
    inner: Box<ESStringInner>,
}

#[cfg(not(feature = "nightly"))]
#[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Clone)]
pub struct String {
    inner: Box<std::string::String>,
}


impl fmt::Debug for String {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{:?}", self.inner)
    }
}

impl fmt::Display for String {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.inner)
    }
}

#[cfg(feature = "nightly")]
impl String {
    pub fn from_utf8_unchecked(bytes: &[u8]) -> Self {
        String { inner: Box::new(ESStringInner::new(bytes)) }
    }

    pub fn as_bytes(&self) -> &[u8] {
        self.inner.as_bytes()
    }

    pub fn as_str(&self) -> &str {
        self.inner.as_str()
    }
    
    pub fn into_string(self) -> std::string::String {
        self.inner.into_string()
    }
}

#[cfg(feature = "nightly")]
pub struct ESStringInner {
    layout: Layout,
    ptr: *mut u8,
}

#[cfg(feature = "nightly")]
impl ESStringInner {
    pub fn new(bytes: &[u8]) -> Self {
        unsafe {
            let len = bytes.len();
            let layout = Layout::array::<u8>(len).unwrap();
            let ptr = alloc(layout);

            for idx in 0..len {
                *(ptr.offset(idx as isize)) = bytes[idx];
            }

            Self { layout, ptr }
        }
    }

    pub fn from_string(s: std::string::String) -> Self {
        Self::new(s.as_bytes())
    }

    pub fn from_str(s: &str) -> Self {
        Self::new(s.as_bytes())
    }

    pub fn from_chars(s: &[char]) -> Self {
        Self::from_string(s.iter().collect::<std::string::String>())
    }

    pub fn len(&self) -> usize {
        self.layout.size()
    }

    pub fn as_mut_ptr(&self) -> *mut u8 {
        self.ptr
    }

    pub fn as_ptr(&self) -> *const u8 {
        self.ptr as *const u8
    }

    pub fn as_bytes(&self) -> &[u8] {
        unsafe { std::slice::from_raw_parts(self.ptr, self.len()) }
    }

    pub fn as_str(&self) -> &str {
        unsafe { std::str::from_utf8_unchecked(self.as_bytes()) }
    }
    
    pub fn into_string(self) -> std::string::String {
        unsafe { std::string::String::from_raw_parts(self.ptr, self.len(), self.len()) }
    }
}

#[cfg(feature = "nightly")]
impl Drop for ESStringInner {
    fn drop(&mut self) {
        unsafe {
            dealloc(self.ptr, self.layout);
        }
    }
}

#[cfg(feature = "nightly")]
impl Clone for ESStringInner {
    fn clone(&self) -> Self {
        Self::new(self.as_bytes())
    }
}

#[cfg(feature = "nightly")]
impl PartialEq for ESStringInner {
    fn eq(&self, other: &ESStringInner) -> bool {
        self.as_bytes().eq(other.as_bytes())
    }
}

#[cfg(feature = "nightly")]
impl Eq for ESStringInner {}

#[cfg(feature = "nightly")]
impl PartialOrd for ESStringInner {
    fn partial_cmp(&self, other: &ESStringInner) -> Option<cmp::Ordering> {
        Some(self.cmp(other))
    }
}

#[cfg(feature = "nightly")]
impl Ord for ESStringInner {
    fn cmp(&self, other: &ESStringInner) -> cmp::Ordering {
        self.as_bytes().cmp(other.as_bytes())
    }
}

#[cfg(feature = "nightly")]
impl hash::Hash for ESStringInner {
    fn hash<H: hash::Hasher>(&self, state: &mut H) {
        self.as_bytes().hash(state);
    }
}

#[cfg(feature = "nightly")]
impl fmt::Debug for ESStringInner {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{:?}", self.as_str())
    }
}

#[cfg(feature = "nightly")]
impl fmt::Display for ESStringInner {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.as_str())
    }
}